13118...98657 (5573-digits)

This number is a prime.

Just showing those entries submitted by 'Jeong': (Click here to show all)

The only known Cullen prime which is also a generalized Fermat prime: 18496*2^18496+1 = 289*2^18502+1 = (17*2^9251)^2+1. [Jeong]